Piston packing



17, 1931. TYLER 1, 96,41

fISTON PACKING Filed June 10. 1929 ,fw z/vroli'. BERT E TYLER PatentedMar. 17, 1931 UNITED STATES mwn mm, or Losmenus, GALH'OBNIA PISTONraoxms Application filed June 10, 1929. Serial No. 369,590.

This invention relates to um pistons, and more particularly to packingor'pistons used in slush or mud pumps.

The object of this invention is to rovide B a piston having packingexpansible y fluid pressure developed within the cylinders durmgoperation of the pump and automatical- I kept in contact with the, pumpliner as the packing wears by self-expanding rings carried b thepacking.

An. em odiment of the invention is illustrated in the accompanyingdrawings, in whichfia Fig. 1 is a sectional view of the pump liner andpiston. v

Fig. 2 is a transverse sectional view taken on line 2-2 of Fig. 1 in thedirection indicated by the arrows.

Fig. 3 is a detail sectional view of the packing.

Fi 4 is a sectional viewsimilar to Fig. 1 showing the modified form.

Referring to the drawings, 10 designates a pump liner in which isdisposed a picton 12.

The piston consists of a body 14 formed of cast metal having a centralportion 16 from which extend oppositely disposed hubs 18 adapted toreceive packing rirgs 20 formed of rubber.

Each packing ring has an annular flange 22 tapered in cross sectionwhich engages ;:the liner wall 24 and is held in contact there- "with bya split expansion ring 26 formed of spring metal resting in a groove 28formed in the flange 22, and is adapted to radiall expand the flange 22into contact t e liner wall as the packing ring lzigieai's.v

The packing rings have a central openin 30 which engages the hubs 18 andare he d in place thereon b nuts 32 threaded on the outer-ends of theubs.

An annular boss 31 is formed on the inner face of the packing ringandfits within a corresponding recess formed in the central portion ofthe body in order to prevent de ormation or lateral displacement of theinner portion of the packing rings due to excessive hydraulic pressure.

It will be noted that an annular groove 21 throu h a bore 37 in the body14 and is threa ed at its outer end to receive nuts 38 which, togetherwith a shoulder 39, secure the piston to the rod.

During operation of the pum the fluid pressure developed within the cyinder will act upon the internal area of the flanges 22 and sleeve 23and expand same into contact with the liner wall and hub 18. Thus itwill be seen that fluid in the annular groove 21 will uniformly expandthe flanges 22 and sleeves 23 and also fiorce the inner ortion 20alternating against the faces of t e central portion 16 during the powerstroke, thereby preventing any grit entering between the sleeves 23 andhubs 18, or between the annular flange 22 and liner wall 24.

the packing wears theex ansion rings will automatically retain the angesin ex panded position, thereby preventing any grit or mud gettingbetween the packing rings and liner wall durin the suction stroke.

The construction illustrated in Fig. 4 is substantially the same asillustrated in the preceding figures, with the exception that the nuts32 and threading on the endof the hubs 18 are replaced with annularflanges 40. The packing elements 22 are exactly similar as in the firstform, the central openings in each element being of slightly lessdiameter than the external diameter of the hubs in order that thepacking rings will firmiy grip the same when the same are positionedthereon, a suitable expanding tool (not shown) being employed to forcethe packing rings over the flanges 40 and onto the seat hubs.

I claim:

1. A piston comprising a cylindrical body member, hubs projecting fromeach end of the body member, packing rings mounted. on said hubs, nutsthreaded on said hubs to retain said packing rings on the body member,and metal expansion rings internally engaging said packing rings.

2 1,vou,41o

2. A piston comprising a body having a central portion and oppositelydisposed hubs projectin therefrom, packing rings having annular angesmounted on said ubs, and

5 split rings of sprin metal internally engaging the flanges 0 saidpackin rings.

3. piston comprising a cylin rical body member, hubs having annularflanges on their outer ends rOJeCting from each end 10 of said body mom1', packin ringshaving o enings therein ada ted to be forced over t eannular flanges 0 said hubs and into engagement with the hubs, and splitrings of spring metal internally engaging the flanges of said packingrings.

In testimony whereof I afiix my si nature.

BERT E. T ER.

